Hay just found this site I have a couple of jeeps one yj and one xj both lifted with mods.My Q is about the xj it hase a rebuild on the 4.0.I bought it this way.I have been working on all the oil leaks have replaced all gaskets and even the distributor (oil came up into disrributor then leaked out lots of oil could not believe it could still run).the problem is it still comes up into the distributor not that much but still not good. I think some one might have put a high volume oil pump in but this alone will not give me my problem.I have checked the pvc valve and the direct intake blow by valve (the one at the back)both move air. I am thinking of make the back one bigger to suck out more blow by / pressure. has any one seen this problem before. Is so I could use some insight. THANKS